Interstitial ads are full-screen ads that cover the interface of their host app. They're typically displayed at natural transition points in the flow of an app, such as during the pause between levels in a game. When an app shows an interstitial ad, the user has the choice to either tap on the ad and continue to its destination or close it and return to the app. Case study.
This guide explains how to integrate interstitial ads into a Unity app.
Prerequisites
- Complete the Get started guide.
テストは必ずテスト広告で行う
以下のサンプルコードには、テスト広告のリクエストに使用できる広告ユニット ID が含まれています。この ID は、どのリクエストに対しても実際の広告ではなくテスト広告を返すように設定されており、安全に使用できます。
ただし、AdMob ウェブ インターフェースにアプリを登録し、アプリで使用する独自の広告ユニット ID を作成した後は、開発中に明示的にデバイスをテストデバイスとして設定する必要があります。
Android
ca-app-pub-3940256099942544/1033173712
iOS
ca-app-pub-3940256099942544/4411468910
Mobile Ads SDK を初期化する
広告を読み込む前に MobileAds.Initialize() を呼び出して、アプリで Mobile Ads SDK を初期化します。この処理は 1 回だけ行います（アプリの起動時に行うのが理想的です）。
using GoogleMobileAds;
using GoogleMobileAds.Api;
public class GoogleMobileAdsDemoScript : MonoBehaviour
{
public void Start()
{
// Initialize the Google Mobile Ads SDK.
MobileAds.Initialize((InitializationStatus initStatus) =>
{
// This callback is called once the MobileAds SDK is initialized.
});
}
}
メディエーションを使用している場合は、すべてのメディエーション アダプタを確実に初期化できるよう、広告を読み込む前にコールバックが発生してください。
Implementation
The main steps to integrate interstitial ads are:
- Load the interstitial ad
- Show the interstitial ad
- Listen to interstitial ad events
- Clean up the interstitial ad
- Preload the next interstitial ad
Load the interstitial ad
Loading an interstitial ad is accomplished using the static Load() method on the
InterstitialAd class. The load method requires an ad unit ID, an
AdRequest object, and a completion handler which
gets called when ad loading succeeds or fails. The loaded
InterstitialAd object is provided as a parameter in
the completion handler. The example below shows how to load an
InterstitialAd.
// These ad units are configured to always serve test ads.
#if UNITY_ANDROID
private string _adUnitId = "ca-app-pub-3940256099942544/1033173712";
#elif UNITY_IPHONE
private string _adUnitId = "ca-app-pub-3940256099942544/4411468910";
#else
private string _adUnitId = "unused";
#endif
private _interstitialAd;
/// <summary>
/// Loads the interstitial ad.
/// </summary>
public void LoadInterstitialAd()
{
// Clean up the old ad before loading a new one.
if (_interstitialAd != null)
{
_interstitialAd.Destroy();
_interstitialAd = null;
}
Debug.Log("Loading the interstitial ad.");
// create our request used to load the ad.
var adRequest = new AdRequest();
// send the request to load the ad.
InterstitialAd.Load(_adUnitId, adRequest,
(InterstitialAd ad, LoadAdError error) =>
{
// if error is not null, the load request failed.
if (error != null || ad == null)
{
Debug.LogError("interstitial ad failed to load an ad " +
"with error : " + error);
return;
}
Debug.Log("Interstitial ad loaded with response : "
+ ad.GetResponseInfo());
_interstitialAd = ad;
});
}
Show the interstitial ad
To show a loaded interstitial ad, call the Show() method on the
InterstitialAd instance. Ads may be shown once per
load. Use the CanShowAd() method to verify that the ad is ready to be shown.
/// <summary>
/// Shows the interstitial ad.
/// </summary>
public void ShowInterstitialAd()
{
if (_interstitialAd != null && _interstitialAd.CanShowAd())
{
Debug.Log("Showing interstitial ad.");
_interstitialAd.Show();
}
else
{
Debug.LogError("Interstitial ad is not ready yet.");
}
}
Listen to interstitial ad events
To further customize the behavior of your ad, you can hook into a number of events in the ad's lifecycle. Listen for these events by registering a delegate as shown below.
private void RegisterEventHandlers(InterstitialAd interstitialAd)
{
// Raised when the ad is estimated to have earned money.
interstitialAd.OnAdPaid += (AdValue adValue) =>
{
Debug.Log(String.Format("Interstitial ad paid {0} {1}.",
adValue.Value,
adValue.CurrencyCode));
};
// Raised when an impression is recorded for an ad.
interstitialAd.OnAdImpressionRecorded += () =>
{
Debug.Log("Interstitial ad recorded an impression.");
};
// Raised when a click is recorded for an ad.
interstitialAd.OnAdClicked += () =>
{
Debug.Log("Interstitial ad was clicked.");
};
// Raised when an ad opened full screen content.
interstitialAd.OnAdFullScreenContentOpened += () =>
{
Debug.Log("Interstitial ad full screen content opened.");
};
// Raised when the ad closed full screen content.
interstitialAd.OnAdFullScreenContentClosed += () =>
{
Debug.Log("Interstitial ad full screen content closed.");
};
// Raised when the ad failed to open full screen content.
interstitialAd.OnAdFullScreenContentFailed += (AdError error) =>
{
Debug.LogError("Interstitial ad failed to open full screen content " +
"with error : " + error);
};
}
Clean up the interstitial ad
When you are finished with an InterstitialAd, make
sure to call the Destroy() method before dropping your reference to it:
_interstitialAd.Destroy();
This notifies the plugin that the object is no longer used and the memory it occupies can be reclaimed. Failure to call this method results in memory leaks.
Preload the next interstitial ad
Interstitial ads are a one-time-use object. This means once an interstitial ad
is shown, the object can't be used again. To request another interstitial ad,
create a new InterstitialAd object.
To prepare an interstitial ad for the next impression opportunity, preload the
interstitial ad once the OnAdFullScreenContentClosed or
OnAdFullScreenContentFailed ad event is raised.
private void RegisterReloadHandler(InterstitialAd interstitialAd)
{
// Raised when the ad closed full screen content.
interstitialAd.OnAdFullScreenContentClosed += ()
{
Debug.Log("Interstitial Ad full screen content closed.");
// Reload the ad so that we can show another as soon as possible.
LoadInterstitialAd();
};
// Raised when the ad failed to open full screen content.
interstitialAd.OnAdFullScreenContentFailed += (AdError error) =>
{
Debug.LogError("Interstitial ad failed to open full screen content " +
"with error : " + error);
// Reload the ad so that we can show another as soon as possible.
LoadInterstitialAd();
};
}
Best practices
- Determine whether interstitial ads are the right type of ad for your app.
- Interstitial ads work best in apps with natural transition points. The conclusion of a task within an app, such as sharing an image or completing a game level, creates such a point. Make sure you consider at which points in your app's flow to best display interstitial ads and how the user is likely to respond.
- Pause the action when displaying an interstitial ad.
- There are a number of different types of interstitial ads such as text,
image, or video. It's important to make sure that when your app displays an
interstitial ad, it also suspends its use of some resources to allow the ad to
take advantage of them. For example, when you make the call to display an
interstitial ad, be sure to pause any audio output being produced by your app.
You can resume playing sounds in the
OnAdFullScreenContentClosed()event, which can be invoked when the user has finished interacting with the ad. In addition, consider temporarily halting any intense computation tasks, such as a game loop, while the ad is being displayed. This ensures that the user doesn't experience slow or unresponsive graphics or stuttered video. - Don't flood the user with ads.
- While increasing the frequency of interstitial ads in your app might seem like a great way to increase revenue, it can also degrade the user experience and lower click-through rates. Make sure that users aren't so frequently interrupted that they're no longer able to enjoy the use of your app.
Additional resources
- HelloWorld example: A minimal implementation of all ad formats.